1. What is a camera?
Is a kind of semiconductor imaging device, so it has the advantages of high sensitivity, anti-glare, small distortion, small size, long life, anti-vibration and so on.
2. How the camera works The image of the subject is focused on the chip by the lens, accumulates the corresponding proportion of charge according to the intensity of the light, the charge accumulated by each pixel shifts point by point under the control of the video timing, and is filtered and amplified. After processing, a video signal output is formed. The video signal is connected to the video input of a monitor or television to see the same video image as the original image.
3. Selection of resolution The indicator for evaluating camera resolution is the horizontal resolution, and the unit is the line pair, that is, the number of black and white line pairs that can be distinguished after imaging. The resolution of commonly used black and white cameras is generally 380-600, and the color is 380-480. The larger the value, the clearer the imaging. For general surveillance applications, a 400-line black-and-white camera can meet the requirements. For special occasions such as medical treatment and image processing, a 600-line camera can obtain clearer images.
4. Imaging Sensitivity The camera sensitivity is usually indicated by the minimum ambient illumination requirement. The sensitivity of a black-and-white camera is approximately 0.02-0.5 Lux and the color camera is more than 1 Lux. The 0.1Lux camera is used for ordinary surveillance applications; when used at night or when the ambient light is weak, a 0.02Lux camera is recommended. When used with near-infrared lamps, low-light cameras must also be used. In addition the sensitivity of the camera is also related to the lens, 0.97Lux/F0.75 is equivalent to 2.5Lux/F1.2 is equivalent to 3.4Lux/F1. Reference Ambient Illumination: Summer Sunshine 100000Lux Cloudy Outdoor 10000Lux TV Station Studio 1000Lux Distance 60W Table Lamp 60cm Tabletop 300Lux Indoor Fluorescent Lamp 100Lux Dusk Interior 10Lux20cm Candlelight 10-15Lux Night Lamp 0.1Lux
5. Electronic shutter The time of the electronic shutter is between 1/50-1/100000 seconds. The electronic shutter of the camera is generally set to the automatic electronic shutter mode. The shutter time can be automatically adjusted according to the brightness and darkness of the environment to obtain a clear image. Some cameras allow the user to manually adjust the shutter time to suit certain special applications.
6. External Synchronization and External Trigger External synchronization means that different video devices use the same synchronization signal to ensure the synchronization of the video signal. It can ensure that the video signals output by different devices have the same frame and line start and end times. In order to achieve external synchronization, a composite sync signal (C-sync) or composite video signal needs to be input to the camera. External synchronization does not guarantee that the user can obtain a complete continuous frame of images from a specified moment. To achieve this function, special cameras with external triggering must be used.
7. Spectral response characteristics The device is made of silicon and is sensitive to near infrared. The spectral response can be extended to about 1.0um. The response peak is green (550 nm) and the distribution curve is shown on the right. When surveillance is performed at night during covert surveillance, near-infrared illumination can be used. The human eye can't see the environment, but it can be clearly imaged on the monitor. Because the sensor surface has a transparent UV-absorbing electrode, it is not sensitive to ultraviolet light. There are red, green and blue filter strips on the imaging unit of the color camera, so the color camera is insensitive to infrared and ultraviolet.
8. Size of the chip The imaging size is usually 1/2", 1/3", etc. The smaller the imaging size, the smaller the camera size can be. In the same optical lens, the larger the imaging size, the larger the angle of view. Chip size Imaging surface size (width X height) Diagonal line 1/26.4x4.8mm8mm1/34.8x3.6mm6mm
The camera part is generally installed on the site and includes a camera, a lens, a protective cover, a bracket, and an electric head. Its role is to photograph the surveillance area and convert it into electrical signals. The camera is divided into two kinds of color and black and white, generally black and white camera than the color of the high sensitivity, more suitable for areas with insufficient light, if the purpose of use is to monitor the location and movement of the scene, you can use black and white video camera; if you want to distinguish The details of the camera object, such as the color of the clothes and the scenery, are preferably colored.
The specifications of the camera can be divided into 1/3 inch, 1/2 inch, and 2/3 inch, and the installation method is fixed and with two kinds of pan/tilt.
Is a kind of semiconductor imaging device, so it has the advantages of high sensitivity, anti-glare, small distortion, small size, long life, anti-vibration and so on.
2. How the camera works The image of the subject is focused on the chip by the lens, accumulates the corresponding proportion of charge according to the intensity of the light, the charge accumulated by each pixel shifts point by point under the control of the video timing, and is filtered and amplified. After processing, a video signal output is formed. The video signal is connected to the video input of a monitor or television to see the same video image as the original image.
3. Selection of resolution The indicator for evaluating camera resolution is the horizontal resolution, and the unit is the line pair, that is, the number of black and white line pairs that can be distinguished after imaging. The resolution of commonly used black and white cameras is generally 380-600, and the color is 380-480. The larger the value, the clearer the imaging. For general surveillance applications, a 400-line black-and-white camera can meet the requirements. For special occasions such as medical treatment and image processing, a 600-line camera can obtain clearer images.
4. Imaging Sensitivity The camera sensitivity is usually indicated by the minimum ambient illumination requirement. The sensitivity of a black-and-white camera is approximately 0.02-0.5 Lux and the color camera is more than 1 Lux. The 0.1Lux camera is used for ordinary surveillance applications; when used at night or when the ambient light is weak, a 0.02Lux camera is recommended. When used with near-infrared lamps, low-light cameras must also be used. In addition the sensitivity of the camera is also related to the lens, 0.97Lux/F0.75 is equivalent to 2.5Lux/F1.2 is equivalent to 3.4Lux/F1. Reference Ambient Illumination: Summer Sunshine 100000Lux Cloudy Outdoor 10000Lux TV Station Studio 1000Lux Distance 60W Table Lamp 60cm Tabletop 300Lux Indoor Fluorescent Lamp 100Lux Dusk Interior 10Lux20cm Candlelight 10-15Lux Night Lamp 0.1Lux
5. Electronic shutter The time of the electronic shutter is between 1/50-1/100000 seconds. The electronic shutter of the camera is generally set to the automatic electronic shutter mode. The shutter time can be automatically adjusted according to the brightness and darkness of the environment to obtain a clear image. Some cameras allow the user to manually adjust the shutter time to suit certain special applications.
6. External Synchronization and External Trigger External synchronization means that different video devices use the same synchronization signal to ensure the synchronization of the video signal. It can ensure that the video signals output by different devices have the same frame and line start and end times. In order to achieve external synchronization, a composite sync signal (C-sync) or composite video signal needs to be input to the camera. External synchronization does not guarantee that the user can obtain a complete continuous frame of images from a specified moment. To achieve this function, special cameras with external triggering must be used.
7. Spectral response characteristics The device is made of silicon and is sensitive to near infrared. The spectral response can be extended to about 1.0um. The response peak is green (550 nm) and the distribution curve is shown on the right. When surveillance is performed at night during covert surveillance, near-infrared illumination can be used. The human eye can't see the environment, but it can be clearly imaged on the monitor. Because the sensor surface has a transparent UV-absorbing electrode, it is not sensitive to ultraviolet light. There are red, green and blue filter strips on the imaging unit of the color camera, so the color camera is insensitive to infrared and ultraviolet.
8. Size of the chip The imaging size is usually 1/2", 1/3", etc. The smaller the imaging size, the smaller the camera size can be. In the same optical lens, the larger the imaging size, the larger the angle of view. Chip size Imaging surface size (width X height) Diagonal line 1/26.4x4.8mm8mm1/34.8x3.6mm6mm
The camera part is generally installed on the site and includes a camera, a lens, a protective cover, a bracket, and an electric head. Its role is to photograph the surveillance area and convert it into electrical signals. The camera is divided into two kinds of color and black and white, generally black and white camera than the color of the high sensitivity, more suitable for areas with insufficient light, if the purpose of use is to monitor the location and movement of the scene, you can use black and white video camera; if you want to distinguish The details of the camera object, such as the color of the clothes and the scenery, are preferably colored.
The specifications of the camera can be divided into 1/3 inch, 1/2 inch, and 2/3 inch, and the installation method is fixed and with two kinds of pan/tilt.
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Commercial lighting is a term used to describe lighting that is used in commercial spaces, including auto dealerships, distribution centers, churches, factories, offices, and warehouses. Unlike residential lighting, commercial lighting is made to withstand more abuse and has a longer lifespan.
While the focus of residential lighting is often on aesthetics, commercial lighting is task orientated. Commercial lighting systems are designed based on what the application is. For example, in an office-type setting, you may see task lighting, which illuminates specific areas where employees need concentrated light to be able to perform their jobs.
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